jacktengg opened a new pull request, #17032:
URL: https://github.com/apache/doris/pull/17032
# Proposed changes
Issue Number: close #xxx
## Problem summary
sql `select convert('a' using utf8)` cause coredump of BE:
```
Thread 338 "FragmentMgrThre" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f0b2c21a700 (LWP 2865259)]
0x00007fff04f8a015 in __gconv_close () from /lib64/libc.so.6
(gdb) bt
#0 0x00007fff04f8a015 in __gconv_close () from /lib64/libc.so.6
#1 0x00007fff04f899e3 in iconv_close () from /lib64/libc.so.6
#2 0x000055556f92f5a7 in doris::vectorized::FunctionConvertTo::close
(this=0x606003f28f50, context=0x6020039fe710,
scope=doris_udf::FunctionContext::THREAD_LOCAL) at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/functions/function_string.h:2442
#3 0x000055556db0598d in doris::vectorized::DefaultFunction::close
(this=0x607000748f00, context=0x6020039fe710,
scope=doris_udf::FunctionContext::THREAD_LOCAL) at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/functions/function.h:524
#4 0x000055556da00b66 in doris::vectorized::VExpr::close_function_context
(this=0x619004ca1d80, context=0x606003fad300,
scope=doris_udf::FunctionContext::FRAGMENT_LOCAL, function=...) at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/exprs/vexpr.cpp:373
#5 0x000055556da16455 in doris::vectorized::VectorizedFnCall::close
(this=0x619004ca1d80, state=0x61c00026c880, context=0x606003fad300,
scope=doris_udf::FunctionContext::FRAGMENT_LOCAL) at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/exprs/vectorized_fn_call.cpp:92
#6 0x000055556da26afd in doris::vectorized::VExprContext::close
(this=0x606003fad300, state=0x61c00026c880)
at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/exprs/vexpr_context.cpp:72
#7 0x000055556d9fcff1 in doris::vectorized::VExpr::close (ctxs=...,
state=0x61c00026c880)
at /mnt/disk2/tengjianping/doris-1.2/be/src/vec/exprs/vexpr.cpp:242
#8 0x000055556aa32c9a in doris::vectorized::VSortExecExprs::close
(this=0x618000345f00, state=0x61c00026c880)
at
/mnt/disk2/tengjianping/doris-1.2/be/src/vec/common/sort/vsort_exec_exprs.cpp:77
#9 0x000055556aa26dae in doris::vectorized::VSortNode::close
(this=0x618000345c80, state=0x61c00026c880)
at /mnt/disk2/tengjianping/doris-1.2/be/src/vec/exec/vsort_node.cpp:129
#10 0x000055556794b5ef in doris::PlanFragmentExecutor::close
(this=0x6170005a35f0)
at
/mnt/disk2/tengjianping/doris-1.2/be/src/runtime/plan_fragment_executor.cpp:676
#11 0x00005555678ce1fb in doris::FragmentExecState::execute
(this=0x6170005a3580)
at /mnt/disk2/tengjianping/doris-1.2/be/src/runtime/fragment_mgr.cpp:258
#12 0x00005555678d6633 in
doris::FragmentMgr::_exec_actual(std::shared_ptr<doris::FragmentExecState>,
std::function<void (doris::PlanFragmentExecutor*)>) (this=0x627000003900,
exec_state=..., cb=...) at
/mnt/disk2/tengjianping/doris-1.2/be/src/runtime/fragment_mgr.cpp:497
#13 0x00005555678d8aa3 in operator() (__closure=0x60800014cda0) at
/mnt/disk2/tengjianping/doris-1.2/be/src/runtime/fragment_mgr.cpp:721
```
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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